Blue Star Sapphire and Diamond Ring in Platinum circa 1950'sBlue Star Sapphire and Diamond Ring in Platinum circa 1950's A Rare Deep Blue Round Cabochon Weighing 11. 75 Carats Approximately. Very Nice Star Which is Rare in The Deep Blue Stars. 27 Baguette Cut Diamonds Weighing 1. 50 Carats Approximately [GH VVS] Star sapphires are a type of sapphire that displays a phenomenon known as asterism, which is the appearance of a six rayed star like pattern that appears to float across the surface of the stone when